Direct ethernet conncetion MBWE and macbook (Snow Leopard)


First of all I’m sorry if there’s already a thread with this topic (couldn’t find it) 
here is my issue:

I use a MyBook external HD world edition white.
I had troubles with my router so I decided to connect the MB directly to my macbook through the ethernet port.
The day I first did it everything worked fined. but then I moved and disconnected it, it’s been a while since I tried to connect it again, and now I have no clue what I did before, but it doesn’t work anymore.  

I can’t see it either on Finder, nor on Safari’s Bonjour. What should I do? I really need to backup and recover some files in a hurry. 

Thank you!

Both connections are valid

Try connecting though Samba 

Go> Connect to Server > smb://mybookworld > admin for user and password